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Do not use an 8 cm (3”) to 12 cm (5”) adapter. – Use discs that conform to compatible standards as indicated by the presence of official logos on the disc label ...
https://in.yamaha.com/files/download/other_assets/3/326983/BD-S473_om_ABL-1.pdf
Do not use this unit within 22 cm (9 inches) of persons with a heart pacemaker implant or defibrillator implant. Radio waves may affect electro-medical devices.
https://in.yamaha.com/files/download/other_assets/2/332022/BD-A1040_om_AL.pdf
